Hognosed Pitvipers are dangerous beauties. They can reach a size of 60 centimeters of length, which is rather small. According to the WCH assessment, their venom is not letal, but can cause uncomfortable symptoms including pain and swelling. This species has two morphs, one with deep red-brown skin and another with brown-gray skin, both of which display small black markings from neck to tail. Each morph is found in different areas in Costa Rica, although being the same species, they can probably still mate and produce viable offspring. Species having multiple morphs feature individuals with different appearances (usually different skin color or patterns in amphibians and reptiles), but each individual will normally only express one morph.